FR2573034A1 - INSTALLATION FOR FILLING AND CLOSING OPEN BAGS WITH THEIR TOP - Google Patents

Abstract

IN THIS INSTALLATION, A FILLED BAG 2 IS LOWERED FROM THE FILLING TUBING 1 TO A RECEPTION TRAY 3 ARRANGES BELOW THE TUBING AND LOCATED ON THE SIDE OF AN ENDLESS BELT CONVEYOR 8. THE FILLED BAG 2 IS PUSHED ON THE CARRIER 8 BY PUSHING SHUTTERS 7, SWIVEL MOUNTS, AND BY PAIRS OF GRIPPING ELEMENTS 4, WHICH ARE PROVIDED ON A PAIR OF SLIDERS 5. GUIDING MEANS 10, LOCATED AT THE LEVEL OF THE UPPER PART OF THE BAGS, ARE ASSOCIATED WITH THE CARRIER 8. THE CARRIER 8 AND THE RECEPTION PLATE 3 ARE LOCATED AT THE SAME HEIGHT. THE BAGS ARRIVING ON THE CARRIER 8 ARE TRANSFERRED TO ANOTHER CARRIER WHICH TAKES THEM TO A CLOSING MACHINE.

Description

"Installation for filling and closing bags open to their part

  The invention relates to an installation for filling and closing bags open on their upper part, with a filling device, a machine for closing them and a lifting and lowering receiving tray which

  carries the filled bag and after which is mounted a trans-

  carrier who transports the filled bag to the closing machine, mechanical means making it possible to transfer the filled bag supported by the receiving tray to the transporter. Such an installation is known from the patent

  German 29 47 872. In this known installation, the

  positive filling is moved between three positions on a horizontal guide. In the middle position, the bag

  is filled and then deposited by lowering the elements

  holding the bag on a receiving tray designed as a vibrating device. The upper end of the bag is held in this position by stationary gripping elements. A pair of welding jaws is arranged on the frame of the filling device; it follows the movement of the latter, which takes place in the

  horizontal direction. The application of the weld seam

  takes place during movement of the filling device from the middle position to the outside position. In this position, the filler neck is lowered, so

  the next bag is placed on the receiving tray.

  An empty bag hangs from the tubing which is then rowed-

  born at the starting position. By a new movement towards the middle position, the bag previously deposited on the tray is held in its upper part by welding jaws. By means of a pushing device also mounted on the frame of the filling device and which surrounds the bag on its rear side, the bag is placed on bars movable in the vertical direction, situated above and between the strips of a conveyor belt. By lowering these bars, the bag is then removed

  of the conveyor belt and transported further.

  However, such an installation does not allow high yields to be achieved since a given time is necessary to produce the weld bead, so

  that the production rate is almost fixed in advance.

  Consequently, the filling device cannot be used to its full capacity. Another significant drawback is the displacement in the horizontal direction of the filling device, the weight of which is relatively large. In addition, once the filled bag is placed on the receiving tray, the height position of the bag is

  again changed, in an extremely unfavorable way.

  Another important drawback is that the installation cannot be coupled to a closing device. As a result, the bag can simply be closed by means

  a weld bead affixed at a distance from the edge of the

chure of the bag.

  Faced with these drawbacks, the present invention has

  for the purpose of perfecting an installation of the men-

  tioned in the introduction so that the yield of the

  filling device is fully usable, the filling device can be coupled to a suitable closing machine, designed according to the type of closure of the upper edge of the bag, and that it occurs

little loss of material.

  To this end, in the installation according to the invention, the receiving plate is arranged in the extension

  vertical filling line and offset laterally-

  ment with respect to the longitudinal axis of the conveyor which transports the filled bags to the closing machine, the support surface of the receiving tray in its upper final position and the support surface of the conveyor are exactly or practically in the same plan, the carrier is designed to receive a single bag, and

  controlled guide means arranged at the level of the trans-

  carrier support the top edge of the directed bag

by gripping elements.

  Since the receiving tray is now in the vertical extension of the filling tube, the filled bag can be placed without moving the latter. It is therefore particularly advantageous

  that the receiving tray is placed next to the trans-

  carrier, the path for transferring the bag to the transport

  tor is then extremely short, which contributes to increasing the yield. Taking into account, moreover, the fact that the upper peripheral surface of the receiving tray (which is in contact with the bottom of the bag) is situated at the same height as the bearing surface of the conveyor, there is no need for additional construction elements for lowering, which further simplifies considerably

  construction of the facility. Since the trans-

  carrier is designed to receive a single bag, in addition to obtaining

  tion of a compact construction method and therefore very small

  brant, the whole journey that the filled bag must complete until it arrives in the closing machine

  is reduced to a minimum, hence an additional increase

  shut up performance. Thanks to the controlled guide means provided in the upper part of the conveyor, the upper edge of the bag is maintained over the entire path from the filling tube to the closing machine,

  so we can consider that it is maintained at a high

  always the same, which means that we can

  switch from hem usually needed - before closing -

  meture. If this operation were, in particular cases, to prove necessary despite everything, at least the cut strip

would it be extremely narrow.

  The bags with side folds in plastics,

  tick, can be closed advantageously by means of a machine working continuously and performing what is called a "head weld joint". With a

  such closing machine, the time required to apply

  that the weld bead at the head is normally greater than the cycle time of the filling device. There are therefore always several bags in the vicinity of the closing machine. Consequently, the closing machine works independently of the rate of the filling device. The transporter mounted downstream of the receiving platform must

  be considered as a transfer element between the dis-

  positive filling and closing machine. Expected

  that the bags brought at the rate of the filling device

  must be removed as quickly as possible from the filling device area, the transporter

  and the corresponding guide means are certainly controlled

  dice in cadence, but their speed depends on the conditions

  imposed by the closing machine. It is therefore particularly

  particularly advantageous that the transporter is designed to

receive only one bag.

  According to a preferred embodiment, it is provided that the conveyor comprises one or more conveyor belts, arranged one behind the other, and that at least the first conveyor belt - seen in the direction of passage of the bags - is provided with parts in

  relief, and preferably ribs extending perpendicular

  cularily in the direction of movement of the strip or in the direction of supply of the filled bags; friction

  resulting from this configuration facilitates consi-

  derailment of the push of the bag on the conveyor. However

  as the pushing of the bag on the conveyor belt

  leads to the exercise of thrust forces acting perpetually

  specifically in the direction of movement of the strip, it is

  appropriate to provide guide bars located on each

  side of the longitudinal edges of the conveyor belt, bars whose upper surfaces are in the

  same plane as the bearing surface of the conveyor belt.

  This effectively prevents warping of the conveyor belt. In order to reduce these thrust forces,

  it is also advantageous for the conveyor belt to pre-

  feels, on its inner side opposite the bearing surface,

  guiding means which may arise, for example

  ple, in the form of at least one trapezoidal belt.

  The belt pulleys, or drive rollers, have a configuration corresponding to that of the conveyor belt. In this way, the pushing forces are reduced not only by the guide bars but also, for

  a relatively large part, by the guide means.

  According to another preferred embodiment, the guide means consist essentially of a belt transmission circulating around vertical axes and of several pressure rollers which can pivot around a common horizontal axis. Thanks to the pivoting pressure rollers, the bag evacuated from the receiving tray can be transported by its upper edge to the belt transmission, where the pressure rollers are released by

  pivot upwards, and do not hinder movement.

  The pressure rollers are controlled so that they

  immediately after they press the upper edge of the bag

  be the belt drive. Since it is only then that the gripping elements are opened, the

  upper edge of the bag remains constantly checked.

  In order to obtain an extreme precision of the transfer to the closing machine, it is particularly appropriate that the rear end - seen in the direction of transport of the

  bags- of the belt drive protrudes from the

  rear half of the conveyor belt towards the closing machine. In this way, the bag continues to be

  guided on its upper edge after leaving the trans-

  carrier. In the presence of several transport bands

  or belt drives fitted with pressure rollers, the last belt drive - seen in the direction of transport - always exceeds the

conveyor belt.

  Adaptation to a different bag length can be achieved very quickly if at least the receiving tray and the carrier are arranged in a frame

  common, equipped with a height adjustment device.

  Insofar as the closing machine is located in line, that is to say located in the direction of transport of the bag from the filling tube to the conveyor, a particularly simple configuration is obtained if the conveyor and the guide means are coupled a pivoting mechanism, intended to rotate the bag supported by the transporter by 90. In order to reduce the journey and the duration, it is appropriate that the axis of

  pivoting is offset from the longitudinal axis

  median nal (relative to the direction of transport of the bags) of the

reception tray.

  Thanks to the higher efficiency obtained, the cycle time is reduced, and the speed of transporting a bag and introducing the bag into the closing machine is therefore increased accordingly. This also leads to an increase in the speed of the welding strip in the closing machine. Given that, to achieve

  a weld bead, there is a relationship between the time

  welding strip temperature and welding time, it is necessary to increase the welding temperature, the welding time being relatively short, which requires longer cooling times. In addition, the closing machine may overheat beyond a maximum allowable temperature. In order to solve these problems, the conveyor may include two conveyor belts arranged one behind the other, synchronously controlled guide means also being provided for the rear conveyor belt - seen in the direction of passage of the bags - to take support the upper part of the bag. The downstream conveyor belt can be controlled by a number of electric motors to halve the speed of the supported bag

  of variable poles. During transfer, this band trans-

  carrier travels at the same speed as the first. In this way, the speed of the bags in the closing machine is reduced. The distance between the different bags is

then weaker.

  The invention will be better understood and other charac-

  téristiques will be highlighted using the following description of some embodiments referring to the accompanying schematic drawing in which: Figure 1 is a partial elevational view of a

  installation according to the invention, seen from the side of the tubu-

  filling lure; Figure 2 is a partial elevational view of an embodiment of an installation according to the invention, seen from the side of the closing machine; Figure 3 is a view corresponding to Figure 2, but with two conveyor belts arranged upstream of the closing machine; Figure 4 is a view corresponding to Figure 2, but showing the opposite side of the installation; Figure 5 is a plan view from above corresponding

in Figure 2.

  In the representation according to FIG. 1, a bag 2 filled by means of a known filling tube 1

  is placed on a receiving tray 3 located in projection

  vertical position, below the filler neck

  1. The filling pipe 1 is shown here as reve-

  naked in its upper final position. The upper end

  of bag 2 is gripped by two pairs of gripping elements

  sion 4 which take the bag near its long edges

  gitudinal. The pairs of gripping elements 4 are arranged on a pair of slides 5 movable in the horizontal direction, not explained here. On the underside of the pairs of slides 5 are arms on which are articulated push flaps 7 actuated by jacks 6. The push flaps 7 are arranged so

  surround, in the retracted position, the edges of the eva- bags

  cués. The pushing shutters 7 are adjustable in height,

  so as to surround the edges of each bag just above

  above the receiving tray 3. The filled bag 2 is then pushed by the horizontal movement of the pairs of sliders 5 onto a conveyor belt 8 placed just next to the receiving tray 3. As can be seen in FIG. 1, the width of the endless belt of the conveyor belt 8 is less than the distance between the walls of the bag.- The longitudinal edges of the endless belt are delimited by plastic edges

  9 not detailed here. Like plastics borders

  tick 9 are arranged so as to form the same plane with the bearing surface of the conveyor belt 8, the edges of the bag rest on these edges. This also helps prevent warping of the endless belt

  conveyor 8 when pushing the bag on the belt.

  In a manner not shown, the endless belt is provided with transverse ribs in order to reduce the forces of

  friction when pushing the bag on the band.

  The upper edge of the bag placed on the trans-

  carrier 8 is held by guide means 10 which, in the present embodiment, consist of a belt transmission 11 circulating around two axes

  vertical and several pressure rollers 13 which can pivot

  ter around a common horizontal axis 12. For the removal of the bag on the conveyor belt 8, the

  pressure rollers to the position designated by 13 '.

  As shown in Figure 1, the pressure rollers 13 are, looking in the direction of transport of the bag, in front of the belt drive 11. Figure 2 shows that the length of the conveyor belt 8

  corresponds approximately to the width of a bag 2 rem-

  fold. In FIG. 2, the pairs of gripping elements 4 and the pushing flaps 7 are still pressed against the bag 2. Consequently, the belt transmission 11 and the

  conveyor belt 8 are then both stopped.

  The conveyor belt is controlled by - a drive device 14 not explained here. The control of the ac, 9 belt transmission 11 takes place in synchronous operation by means of a motor, not shown. Once the pressure rollers 13 have been pivoted against the upper edge of the bag, the pairs of gripping elements 4 release the bag. The pair of slides 5 returns to its initial position and the drive device 14 is started, so that the bag 2 is transferred to a discharge belt 15 leading to a closing machine. Figure 2 further shows that the rear end seen in

  the direction of passage of the bag 2- of the transmission by cour-

  line 11 protrudes from the rear end of the trans-

  carrier 8. In this way, the upper end of the bag

  continue to be guided while the bag is already on the discharge belt. We can also see, at the

  Figure 2, that the discharge band 15 and the trans-

  carrier 8 are arranged in a common frame 16, which is provided with a height adjustment device 17. The latter consists essentially of a geared motor 18 and several pin drives 19, the pins being driven by the bike -reducer 18 via chains 20. In a manner not shown, the plate of

  reception 3 can also be placed on the frame 16.

  In the embodiment shown in Figure 3, another conveyor belt 8 'is disposed between the discharge belt 15 and the conveyor belt 8; this other strip 8 ′ is also mounted in the frame 16. The

  conveyor belts 8, 8 'are, for the most part, of

  identical truction. In addition, another belt transmission 11 'is provided in alignment with the belt transmission 11, above the conveyor belt 8'; other pressure rollers (not shown) are assigned to this belt transmission 11 '. Belt transmissions 11, 11 'and the various pressure rollers

  13 are also, for the most part, of identical construction.

  tick. The conveyor belt 8 ′ is driven by a motor 14 ′ with a variable number of poles, in order to reduce the speed of transport of the bag once released by the conveyor belt 8 and the guide means 10. As can be clearly seen from the Figure 3, the distance between the bags

  on the discharge strip 15 is thus reduced. In advise-

  quence, the speed in the closing machine can be lower than the speed at which the filled bags are

  evacuated from the filling pipe 1.

  FIG. 4 shows that the pressure rollers 13 are pivoted against the upper edge of the bag before the pairs of gripping elements 4 release the bag and the pushing flaps 7 are brought back by

  pivot to their rest position. In the representation

  tion according to Figure 5, the belt transmission 11

  is extended beyond the trans-band area

  carrier 8 located below, and therefore extends to the

  above the discharge belt 15. Outside the pressure bearing zone 13, an additional belt 21 is assigned to the belt transmission 11, so that the edge

  upper part of the bag is guided between these two belts.

  In a manner not shown, the conveyor belt 8 and the guide means 10 may be pivotally provided

  around a vertical axis, in order to place the iron machine

  in line with the filling device.

Claims (30)

- CLAIMS -   1.- Installation for filling and closing open bags on their upper part, with a bag filling device, a machine for closing them and a lifting and lowering receiving tray which carries the filled bag and after which is mounted a transporter which transports the filled bag to the machine   closing, mechanical means allowing   the filled bag supported by the receiving plate on the conveyor, characterized in that the receiving plate (3) is arranged in the vertical extension of the filling tube (1) and offset laterally with respect to the longitudinal axis the transporter (8) which   transports the filled bags (2) to the iron machine   measurement, in that the bearing surface of the receiving plate   tion (3) to its upper final position and the surface   carrier support (8) are located exactly or   in the same plane, in that the conveyor (8) is designed to receive a single bag (2), and in that controlled guide means arranged at the conveyor (8) support the upper edge of the   bag directed by gripping elements (4). -   2.- Installation according to claim 1, charac-   characterized in that the conveyor (8) comprises one or more conveyor belts (8a) arranged one behind the other, and in that at least the first conveyor belt (8a) - viewed in the direction of passage of the bags (2 ) - is provided with raised parts, and preferably ribs extending perpendicular to the direction of movement of the strip or even in the direction of supply filled bags (2).   3.- Installation according to claim 2, charac-   characterized in that at least the first conveyor (8) has guide bars (9) located on each side of the longitudinal edges of the conveyor belt (8a), bars whose upper surfaces lie in the same plane as the surface of the conveyor belt (8a).   4.- Installation according to claim 2, charac-   terized in that at least the conveyor belt (8a) of the first conveyor (8) has, on its inner side opposite the bearing surface, guide means,   preferably in the form of at least one trapezoid belt   dale, and in that the belt pulleys are provided   corresponding configuration grooves.   5.- Installation according to claim 4, charac-   characterized in that the conveyor belt (8a) has two guide means located in the vicinity of its longitudinal edges.   6.- Installation according to claim 1, charac-   characterized in that the first conveyor (8) and the corresponding guide means (10) are coupled to a pivoting mechanism which simultaneously makes it possible to rotate the filled bag coming from the receiving tray (3) by an angle of 90 in view to take it over and transport the bag further.   7.- Installation according to claim 6, charac-   characterized in that the pivot bearings of the conveyor (8) and of the controlled guide means (10) are seen in   the direction of evacuation of the bag (2) from the filler neck   sage (1) - arranged eccentrically to the direction of bag transport.   8.- Installation according to claim 1, charac-   that the transporter (8) and the means of   guide (10) can be driven in synchronous operation.   9.- Installation according to claim 8, charac-   characterized in that the conveyor (8) and the guide means (10) each have their own drive device. 10.Installation according to claim 8 or 9, characterized in that the conveyor (8) and the guide means (10) are controlled intermittently   at the rate of the filling device.   11.- Installation according to any one of the res-   dications 1 to 10, characterized in that the conveyor (8) and the guide means (10) are coupled by means of a vertical axis, and in that the pivoting mechanism, which is preferably a connecting rod-crank mechanism , is articulated to this axis.   12.- Installation according to any one of the res-   dications 1 to 11, characterized in that the distance between the idler pulleys of the conveyor (8) corresponds   exactly or approximately the width of the bag.   13.- Installation according to claim 1, charac-   characterized in that the conveyor (8) is produced in the form of a train of rollers having several rollers controlled in synchronous operation with the guide means (10).   14.- Installation according to claim 1, charac-   characterized in that the receiving plate (3) is adjustable   in height to adapt to different bag lengths.   15.- Installation according to claim 1, charac-   terrified in what it is planned, above the plateau of   reception (3), two pushing flaps (7) adjustable in height   tor relative to the latter and assigned to a slider   carrier of gripping elements, flaps which can   can rotate around a vertical axis to exit the area movement of the bag.   16.- Installation according to claim 15, charac-   characterized in that two pairs of gripping elements (4)   arranged above the receiving tray (3) are affected   tees with push shutters (7) and are able to grasp the   bag removed from the filler neck (1) on the plate   receiving plate (3), below the edge of the mouth   of the bag and in the vicinity of the longitudinal edges of the bag.   17.- Installation according to claim 16, charac-   characterized in that the pairs of gripping elements (4) and the pushing flaps (7) are arranged on a pair of   slides (5) movable in the horizontal direction.   18.- Installation according to claim 1, charac-   characterized in that the receiving plate (3) is designed as a vibrating device, so that this receiving plate (3) is in the form of a table vibrant raising and lowering.   19.- Installation according to claim 1, charac-   characterized in that the controlled guide means (10) are   essentially constituted by a transmission by cour-   line (11) circulating around vertical axes and several pressure rollers (13) which can pivot around an axis common horizontal.   20.- Installation according to claim 19, charac-   characterized in that in order to guide the edge of the bag into the closing machine, the belt transmission (11) protrudes from the conveyor (8).   21.- Installation according to any one of the res-   dications 1 to 20, characterized in that the speed of movement of the conveyor (8) and of the guide means (10) corresponds to the cyclic speed of the pairs of gripping elements (4) arranged on the pair of slides (5) , pushing shutters (7), the closing machine mounted downstream and the discharge band;   22.- Installation according to claim 1, charac-   terized in that at least the receiving plate (3) and the conveyor (8) are adjustable in height centrally by means of an adjustment device in height.   23.- Installation according to claim 22, charac-   terized in that the receiving plate (3), the   carrier (8) and the discharge band (15) leading to the closing machine are arranged in the frame (16) and   centrally adjustable.   24.- Installation according to claim 1, in   which the closing machine is arranged in the vicinity   fills the filling device, perpendicular to the   direction of transport of the bag, characterized in that the trans-   carrier (8) and the guide means (10) are only adjustable in height.   25.- Installation according to any one of the res-   dications 1 to 24, characterized in that the conveyor (8) and the guide means (10) are controlled at the rate of the filling tube (1) so that the transfer from the filled bag to the discharge belt ( 15) leading to the closing machine takes place during the displacement of the pairs of gripping elements (4) and the pushing flaps (7) of the conveyor (8) towards the plate reception (3).   26.- Installation according to claim 2, with a closing machine working continuously, arranged perpendicular to the direction of transport of the filled bag in the vicinity of the filling pipe, characterized in that two conveyor belts (8.8 ') are provided. arranged one behind the other, and in that means   guides (10 ') synchronously controlled are also   Lely assigned to the rear carrier (8 ') - seen in the direction of passage of the bags (2) - to take care of the upper part of the bag.   27.- Installation according to claim 26, charac-   characterized in that the second conveyor (8 ') - seen in the direction of passage of the bags - is controlled by an electric motor with variable number of poles (14), allowing   reduce the speed at which bags pass.   28.- Installation according to claim 26, charac-   characterized in that the conveyors (8,8 ') arranged one   behind the other are, essentially, of a mode of cons- identical truction.   29.- Installation according to claim 26, charac-   characterized in that the controlled guide means (10, 10 ') - arranged one behind the other are, for the most part,   of an identical construction method.   30.- Installation according to any one of the res-   dications 1 to 29, characterized in that the transmission   by rear belt (11 or 11 ') of the guide means   respondents (10 or 10 ') extends to the vicinity of the discharge band (15).